# Relationship history for MSHA mine 0102870

Current hierarchy: **Roy D  Partin → Roy Partin Sand & Gravel → Pit #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** William  Mc Leod → Pit #2; 1989-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Friese Materials Corp → Pit #2; 1990-08-01 to 1991-07-15; source msha-controller-operator-history
- **controller_controls_operator:** William  Mc Leod → Friese Materials Corp; 1990-08-01 to 1991-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Roy Partin Sand & Gravel → Pit #2; 1991-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy D  Partin → Pit #2; 1991-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy D  Partin → Roy Partin Sand & Gravel; 1991-07-16 to current/open; source msha-controller-operator-history